• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2002.11a
• /
• pp.155-156
• /
• 2002

우리나라의 급속한 산업발전에 따른 산업구조의 변화와 자동차 수의 증가에 따라서 오존 전구물질인 VOC와 NOx의 배출량이 크게 증가하고 있다. 이에 따라서 고농도 오존 현상이 발생하는 빈도가 증가하는 추세에 있다. 오존은 VOC와 NOx간의 광화학 반응으로 형성하므로. VOC와 NOx중의 하나는 제한종(limiting species)로 작용하게 되므로, 광화학 반응을 분석하여 제한종을 규명하여야만 효율적 오존 저감대책을 세울 수 있다. (중략)

• Korean Journal of Materials Research
• /
• v.6 no.3
• /
• pp.282-290
• /
• 1996

광화학 반응의 초기 유발을 위한 광촉매로 TiO2가 가장 널리 알려져 있으며, 기존의 상품보다 광촉매 활성도가 높은 촉매를 얻기 위해 Sol-Gel법을 이용하였다. TiO2 광촉매 제조를 위하여 전구체로서 Tetra-eth해-ortho-titanate(TEOT)를 이용하여 xerogeol 분말을 얻었으며, 광화학 반응의 효율을 측정하기 위해 분해대상 물질을 Dichloroacetic acid(DCA)로 선정하였다. 순수 titania 졸을 얻기 위한 최적조건은 알콕사이드 1몰당 물 40몰, 산 0.05몰이었고 pH의 범위는 3.3-3.6이었으며 Hexylene Glycol(HG)의 첨가량은 1몰임을 알 수 있었다. BET-N2방법을 이용하여 표면적을 측정한 결과 물/알콕 사이드의 몰비가 40-80범위에서 비표면적이 급격히 증가되어 DCA 의 광분해율도 증가하였으며, 몰 40몰을 첨가 후 졸-겔법으로 제조한 분말을 40$0^{\circ}C$에서 1시간 열처리한 anatase phase의 TiO2가 최고의 광분해 효율인 약 21%를 보였다. 이는 상업용으로 가장 효율이 높은 Dagussa P-25의 DCA 분해 효율보다 2배 정도 높은 것으로 나타났다.

• Journal of Bio-Environment Control
• /
• v.19 no.1
• /
• pp.36-48
• /
• 2010

This present study was conducted to investigate photosynthetic characteristics, chlorophyll fluorescence, chlorophyll contents of Betula platyphylla var. japonica, Prunus leveilleana, Magnolia sieboldii, growing under four different light intensity regimes (full sun, and 64~73%, 35~42%, 9~16% of full sun). As result, Betula platyphylla var. japonica showed outstanding photosynthetic capacity and apparent quantum yield in full sun and showed low shade tolerance. Prunus leveilleana showed good photosynthetic capacity and apparent quantum yield in 64~73% or 35~42% of full sun and showed common shade tolerance. However, Magnolia sieboldii showed good photosynthetic capacity and apparent quantum yield in 35~42% of full sun, while the lowest in full sun. Magnolia sieboldii showed the highest shade tolerance compared to the other species. As the shading level increased, the total chlorophyll contents of all species increased with significant difference.

• Korean Journal of Environmental Biology
• /
• v.34 no.4
• /
• pp.264-271
• /
• 2016

The objective of this study was to determine the growth and light utilization efficiency of garden plants in shade area through chlorophyll fluorescence reaction analysis. Ten garden plants was grown for 75 days under 50% and 80% shading conditions. Under shading, $ET2_O/RC$, the fluorescence parameter related to electron-transport in photosystem II, was effectively enhanced. However, the electron transport flux until PSI acceptors per reaction center ($RE1_O/RC$) was reduced. These changes in photochemical parameters evoked a decrease in performance index (PI) and driving force (DF) of electron transport flux. In addition, some photochemical parameters such as $F_V$, $FV/F_O$, $RE1_O/RC$, $ET2_O/RC$, $PI_{TOTAL\;ABS}$, and $DF_{TOTAL\;ABS}$ were found to be important for shade tolerance. Three species (Pachysandra terminalis Siebold & Zucc, Physostegia virginiana L., and Carex maculata Bott) were found to be shade tolerant. Based on these results, shading factor index (SFI) deduced from photochemical parameters is useful for evaluating of shading stress of garden plants.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2000.11a
• /
• pp.432-433
• /
• 2000

고농도의 오존은 인간이나 동물의 건강뿐이 아닌 식물 및 토양등에도 중요한 영향을 미치는 것으로 확인되었으며, 따라서 날로 그 관심도가 증대되고 있다. 오존의 효율적 제어를 위해서는 오존 생성 메카니즘을 면밀히 분석하여 어떠한 물질 혹은 물질의 비율이 고농도 오존 발생과 연관성이 있는지에 대한 연구가 선행되어야 한다. 본 연구에서는 광화학 반응모델에서 초기농도 등에 따른 민감도 분석결과를 바탕으로 고농도 오존에 영향을 주는 지표를 살펴보고, 오존농도의 효율적 제어를 위한 기초자료로 활용하고자 한다. (중략)

• Journal of the Korean Chemical Society
• /
• v.53 no.3
• /
• pp.302-307
• /
• 2009

Investigation was conducted to examine whether photochemical reaction of N-(tributylstannyl)- methylphthalimide generates an azomethine ylide intermediate in its excited state as its silyl derivative N-(trimethylsilyl)methylphthalimide which has been observed to form an azomethine ylide. The irradiation of N-(tributylstannyl)methylphthalimide in $D_2O-CH_3$CN generates mono-deuterated N-methylphthalimide as an exclusive product which supports the efficient generation of azomethine ylide intermediate and its trapping by water molecule through a proto-destannylation pathway. However the generated tributylstannyl subsitiuted ylide was not observed to be trapped with a dipolarophile such as methyl acrylate and acrylonitrile present in the reactions which is in contrast with the ylide from N-(trimethylsilyl)methylphthalimide.

• Journal of Bio-Environment Control
• /
• v.19 no.2
• /
• pp.97-108
• /
• 2010

The present study was conducted to investigate photosynthetic responses (Pn), chlorophyll fluorescence (Pe), chlorophyll contents of Allium victorialis var. platyphyllum, Ligularia fischeri, and Ligularia stenocephala growing at four different fertilizing schemes (non-fertilizing and 2.5 $g{\cdot}l^{-1}$, 5 $g{\cdot}l^{-1}$, 10 $g{\cdot}l^{-1}$ fertilizing). Three wild vegetables showed outstanding Pn and Pe at 5 $g{\cdot}l^{-1}$ fertilizing treatment. 10 $g{\cdot}l^{-1}$ of fertilizer, however, proved to be too much eventually leading to declined growth. A. victorialis var. platyphyllum showed good Pn and Pe under shade treatment whereas Pn and Pe of L. fischeri, and L. stenocephala showed the opposite tendency. The chlorophyll contents of the three wild vegetables showed the highest measurement ranging between 11.70~24.36 $mg{\cdot}g^{-1}$ when treated with 5 $g{\cdot}l^{-1}$ of fertilizer. Also it was showed that there were more chlorophyll contents under shade treatment as opposed to full sun. These results showed that 5 $g{\cdot}l^{-1}$ fertilizing treatment is optimal fertilizing of three wild vegetables and fertilizing and light intensity controlling is very important for productivity of vegetables.

• Korean Journal of Agricultural and Forest Meteorology
• /
• v.7 no.2
• /
• pp.156-163
• /
• 2005

This study was conducted to compare the physiological and biochemical responses of P. orientalis and L. tulipifera in response to ozone. One-year-old seedlings of P. orientalis and L. tulipifera were exposed to 100 ppb ozone concentration for 2, 4, or 8 hr/day for 1 week. Photosynthesis, stomatal conductance and ozone uptake rate were measured daily, and chlorophyll fluorescence, carboxylation efficiency, chlorophyll content, and SOD activity were measured after 1 week. In P. orientalis, photosynthesis and stomatal conductance were not decreased in the 2h/day ozone treatment, but the L. tulipifera response was more sensitive even in the 2h/day ozone treatment. Increased treatment time decreased photosynthesis and stomatal conductance. Chlorophyll fluorescence was not significantly different among treatment times. However, carboxylation efficiency decreased with increased treatment time, and L. tulipifera was more sensitive than P. orientalis. Chlorophyll content did not differ with species or treatment time. SOD activity response was greater in L. tulipifera than in P. orientalis, increasing to $131\%$ of pretreatment observations. Therefore it was concluded that L. tulipifera was more responsive and had lower ozone tolerance than P. orientalis.

• Korean Journal of Environmental Biology
• /
• v.34 no.3
• /
• pp.161-168
• /
• 2016

In this study, growth enhancing effect of hatchery waste egg decomposed liquid fertilizer in pepper plant cultivation through chlorophyll fluorescence (O-J-I-P) analysis. In a whole growth period, egg decomposed fertilizer treated pepper grew well than non treated plant, though it was not statistically significantly different. Amount of chlorophyll fluorescence of non treated plant was higher thant that of fertilizer treated plant. It is determined that eventually lead to increased photosynthesis. In this study, six parameters, Fo, ABS/RC, RC/ABS, TRo/RC, DI0/RC, and DF Total ABS were the important factors represent efficiency of photochemical responses of pepper plant treated with hatchery waste egg decomposed fertilizer.

• Proceedings of the Korean Society of Fisheries Technology Conference
• /
• 2000.05a
• /
• pp.213-213
• /
• 2000

점토살포에 의한 적조생물 구제효과가 알려지면서, 점토광물로 구성되어있는 산야토양 성분인 황토의 적조구제에 대한 관심도가 매우 높아지고 있으며, 최근 한국에서는 대규모로 발생되고 있는 Cochlodinium polykrikoides 적의 구제물질로서 황토를 대량 사용하고 있다. 그러나 황토의 적조구제 효율은 약 20∼80% 범위로서, 황토의 종류, 입자크기 및 살포방법 등에 따라 큰 차이를 보이고 있다. 이에 황토의 적조구제효과를 증진시키려는 일련의 노력들이 활발히 이루어지고 있다. (중략)